Hip! Hip! Hurrah!

Hip is said to be a notarica, composed of the initial letters
of Hicrosolyma Est Perdita. Henri van Laun says, in Notes and
Queries, that whenever the German knights headed a Jew-hunt in the
Middle Ages, they ran shouting “Hip! Hip!” as much as to say “Jerusalem
is destroyed.” (See Notarica.)

Timbs derives Hurrah from the Sclavonic hu-raj (to
Paradise), so that Hip! hip! hurrah! would mean “Jerusalem is
lost to the infidel, and we are on the road to Paradise.” These etymons
may be taken for what they are worth. The word hurrah! is a
German exclamation also.

“Now, infidel, I have thee on the hip” (Merchant of Venice);

and again, “I'll have our Michael Cassio on the hip” (Othello),
to have the whip hand of one. The term is derived from wrestlers, who
seize the adversary by the hip and throw him.

In fine he doth apply one speciall drift.
Which was to get the pagan on the hip,
And having caught him right, he doth him lift
By nimble sleight, and in such wise doth trip,
That down he threw him.